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Crain's Scale / Gauge Encyclopedia
36 Scale Name:  S Scale          
  Scale Ratio:  1:64    
  Alternate Names:  3/16 inch = 1 foot    3/16 inch Scale      
       H1 Scale     CD Scale    
     Represented  Scale       Model Track Gauge Error  Track
  Ser #     Gauge  Inches Ratio   In/ft  mm/ft       Inches           mm %  Used
  Correct Gauge:      
36 853  4ft 8.5in 56.5 64 0.188 4.76 0.883   22.42   0.0  
36 854  Meter 39.4 64 0.188 4.76 0.616   15.64   0.0  
36 855  3 Foot 36 64 0.188 4.76 0.563   14.29   0.0  
36 856  2.5 Foot 30 64 0.188 4.76 0.469   11.91   0.0  
36 857  2 Foot 24 64 0.188 4.76 0.375   9.53   0.0  
36 858  15 Inch 15 64 0.188 4.76 0.234   5.95   0.0  
  Commonly Used Gauges  
36 859  S Broad 66 66 64 0.188 4.76 1.030   26.16   -0.1  
36 860  Proto 64 56.5 64 0.188 4.76 0.883 0.906 22.43 23.01 0.0  
36 861  S Fine Ga 56.5 64 0.188 4.76 0.883 0.906 22.43 23.01 0.0  
36 862  H1 Gauge 56.5 64 0.188 4.76 0.875 0.898 22.23 22.81 -0.9  Sstd
36 863  C-D Gauge 56.5 64 0.188 4.76 0.875 0.898 22.23 22.81 -0.9  Sstd
36 864  S Gauge 56.5 64 0.188 4.76 0.875 0.898 22.23 22.81 -0.9  Sstd
36 865  64 / 22.5 Ga 56.5 64 0.188 4.76 0.875 0.898 22.23 22.81 -0.9  Sstd
36 866  S Hi-Rail 56.5 64 0.188 4.76 0.865 0.885 21.97 22.48 -2.0  Lionel, Am Flyer
36 867  Sn3.5 Ga 42 64 0.188 4.76 0.649 0.672 16.48 17.07 -1.1  HOstd
36 868  HO Gauge 42 64 0.188 4.76 0.649 0.672 16.48 17.07 -1.1  HOstd
36 869  64 / 16.5 Ga 42 64 0.188 4.76 0.649 0.672 16.48 17.07 -1.1  HOstd
36 870  Sm Gauge 39.4 64 0.188 4.76 0.650 0.669 16.51 16.99 5.6  HOstd
36 871  HO Gauge 39.4 64 0.188 4.76 0.649 0.672 16.48 17.07 5.4  HOstd
36 872  64 / 16.5 Ga 39.4 64 0.188 4.76 0.649 0.672 16.48 17.07 5.4  HOstd
36 873  HO Gauge 36 64 0.188 4.76 0.649 0.672 16.48 17.07 15.4  HOstd
36 874  Proto 64n3 36 64 0.188 4.76 0.563 0.586 14.30 14.88 0.1  Sn3
36 875  Sn3 Gauge 36 64 0.188 4.76 0.563 0.586 14.30 14.88 0.1  Sn3
36 876  64 / 14.3 Ga 36 64 0.188 4.76 0.563 0.586 14.30 14.88 0.1  Sn3
36 877  Sn2.5 Ga 30 64 0.188 4.76 0.471 0.483 11.96 12.27 0.5  TTstd
36 878  Se Gauge 29.5 64 0.188 4.76 0.471 0.483 11.96 12.27 2.2  TTstd
36 879  Sm750 Ga 29.5 64 0.188 4.76 0.471 0.483 11.96 12.27 2.2  TTstd
36 880  TT Gauge 30 64 0.188 4.76 0.471 0.483 11.96 12.27 0.5  TTstd
36 881  64 / 12 Ga 30 64 0.188 4.76 0.471 0.483 11.96 12.27 0.5  TTstd
36 882  Sn2 Gauge 24 64 0.188 4.76 0.353 0.367 8.97 9.32 -5.9  Nstd
36 883  9 mm Gauge 24 64 0.188 4.76 0.353 0.367 8.97 9.32 -5.9  Nstd
36 884  N Gauge 24 64 0.188 4.76 0.353 0.367 8.97 9.32 -5.9  Nstd
36 885  64 / 9 Ga 24 64 0.188 4.76 0.353 0.367 8.97 9.32 -5.9  Nstd
   
This is a popular scale with many ardent adherents. The equipment is big  
enough to see detail modeling, yet small enough to allow for a decent sized  
railway in a basement or garage. S Hi-Rail is epitomized by American Flyer and  
Lionel train sets. The original S Scale name, H1, meant half of Number 1 Scale    
(1:32) but was sometimes shown as 1:60 scale.  
   
A scale of 1:65 is mentioned, using HO track for 42" gauge in Japan.  
   
36 886  HO Gauge 42 65 0.185 4.69 0.649 0.672 16.48 17.07 0.4  HOstd
   
Crain's Scale / Gauge Encyclopedia
37 Scale Name:  British OO Scale      
  Scale Ratio:  1:76.2    
  Alternate Names:  4.0 mm = 1 foot   4 mm Scale    
       Double-Oh Scale   Dublo Scale   EEM Scale  
       P4 Scale     S4 Scale   Scalefour  
     Represented  Scale       Model Track Gauge Error  Track
  Ser #     Gauge  Inches Ratio   In/ft  mm/ft       Inches           mm %  Used
  Correct Gauge:      
37 887  4ft 8.5in 56.5 76.2 0.157 4.00 0.741   18.83   0.0  
37 888  Meter 39.4 76.2 0.157 4.00 0.517   13.13   0.0  
37 889  3 Foot 36 76.2 0.157 4.00 0.472   12.00   0.0  
37 890  2.5 Foot 30 76.2 0.157 4.00 0.394   10.00   0.0  
37 891  2 Foot 24 76.2 0.157 4.00 0.315   8.00   0.0  
37 892  15 Inch 15 76.2 0.157 4.00 0.197   5.00   0.0  
  Commonly Used Gauges   ("Double-Oh")  
37 893  OO Wide Ga 84.3 76.2 0.157 4.00 1.106   28.09   0.0  
37 894  OO Broad 63 76.2 0.157 4.00 0.877   22.28   6.1  P4std
37 895  P4 Gauge 56.5 76.2 0.157 4.00 0.741   18.82   -0.1  P4std
37 896  Protofour 56.5 76.2 0.157 4.00 0.741   18.82   -0.1  P4std
37 897  OO/EM/18.83 56.5 76.2 0.157 4.00 0.741   18.82   -0.1  P4std
37 898  S4 Gauge 56.5 76.2 0.157 4.00 0.741   18.82   -0.1  P4std
37 899  Scalefour 56.5 76.2 0.157 4.00 0.741   18.82   -0.1  P4std
37 900  EMF Gauge 56.5 76.2 0.157 4.00 0.741   18.82   -0.1  P4std
37 901  EEM Gauge 56.5 76.2 0.157 4.00 0.741   18.82   -0.1  P4std
37 902  76 / 18.8 Ga 56.5 76.2 0.157 4.00 0.741   18.82   -0.1  P4std
37 903  EM Gauge 56.5 76.2 0.157 4.00 0.717   18.21   -3.3  EMstd
37 904   3/4" Gauge 56.5 76.2 0.157 4.00 0.750 0.772 19.05 19.61 1.2  OOstd
37 905  OO Ga Brit 56.5 76.2 0.157 4.00 0.650 0.669 16.51 16.99 -12.3  HOstd
37 906  OO/H Gauge 56.5 76.2 0.157 4.00 0.650 0.669 16.51 16.99 -12.3  HOstd
37 907  HO Gauge 56.5 76.2 0.157 4.00 0.649 0.672 16.48 17.07 -12.5  HOstd
37 908  76 / 16.5 Ga 56.5 76.2 0.157 4.00 0.649 0.672 16.48 17.07 -12.5  HOstd
37 909  Bing OO 56.5 76.2 0.157 4.00 0.625   15.88   -15.7  
37 910  Table Top 56.5 76.2 0.157 4.00 0.625   15.88   -15.7  
37 911  OOn3 Gauge 36 76.2 0.157 4.00 0.471 0.483 11.96 12.27 -0.3  TTstd
37 911a  OO-12 Gauge 36 76.2 0.157 4.00 0.471 0.483 11.96 12.27 -0.3  TTstd
37 912  TT Gauge 36 76.2 0.157 4.00 0.471 0.483 11.96 12.27 -0.3  TTstd
37 913  OOn27 Ga 27 76.2 0.157 4.00 0.353 0.367 8.97 9.32 -0.4  Nstd
37 914  9 mm Gauge 27 76.2 0.157 4.00 0.353 0.367 8.97 9.32 -0.4  Nstd
37 915  N Gauge 27 76.2 0.157 4.00 0.353 0.367 8.97 9.32 -0.4  Nstd
37 916  OO-9 Gauge 27 76.2 0.157 4.00 0.353 0.367 8.97 9.32 -0.4  Nstd
37 917  OO9 Gauge 27 76.2 0.157 4.00 0.353 0.367 8.97 9.32 -0.4  Nstd
37 918  OOe Gauge 27 76.2 0.157 4.00 0.353 0.367 8.97 9.32 -0.4  Nstd
37 919  76 / 9 Ga 27 76.2 0.157 4.00 0.353 0.367 8.97 9.32 -0.4  Nstd
   
See following table for USA Double-Oh Scale  
Bing OO was also known as "Table Top" (not same as TT scale).  
S4 is a super fine scale standard, P4 is fine scale version of EEM and OO.  
   
Crain's Scale / Gauge Encyclopedia
38 Scale Name:  USA OO Scale      
  Scale Ratio:  1:76.2    
  Alternate Names:  USA Double-Oh  5/32 inch = 1 foot        
     Represented  Scale       Model Track Gauge Error  Track
  Ser #     Gauge  Inches Ratio   In/ft  mm/ft       Inches           mm %  Used
  Correct Gauge:      
38 920  4ft 8.5in 56.5 76.2 0.157 4.00 0.741   18.83   0.0  
38 921  Meter 39.4 76.2 0.157 4.00 0.517   13.13   0.0  
38 922  3 Foot 36 76.2 0.157 4.00 0.472   12.00   0.0  
38 923  2.5 Foot 30 76.2 0.157 4.00 0.394   10.00   0.0  
38 924  2 Foot 24 76.2 0.157 4.00 0.315   8.00   0.0  
38 925  15 Inch 15 76.2 0.157 4.00 0.197   5.00   0.0  
  Commonly Used Gauges USA  
38 926  OO(USA) Ga 56.5 76.2 0.157 4.00 0.750 0.772 19.05 19.61 1.2  OOstd
38 927  OO Gauge 56.5 76.2 0.157 4.00 0.750 0.772 19.05 19.61 1.2  OOstd
38 928   3/4 " Gauge 56.5 76.2 0.157 4.00 0.750 0.772 19.05 19.61 1.2  OOstd
38 929  On3 Gauge 56.5 76.2 0.157 4.00 0.750 0.772 19.05 19.61 1.2  On3
38 930  OOm Gauge 39.4 76.2 0.157 4.00 0.517   13.13 0.00 0.0  
38 931  OOn3 Gauge 36 76.2 0.157 4.00 0.471 0.483 11.96 12.27 -0.3  TTstd
38 932  TT Gauge 36 76.2 0.157 4.00 0.471 0.483 11.96 12.27 -0.3  TTstd
38 933  OOn2.5 Ga 30 76.2 0.157 4.00 0.413 0.429 10.49 10.90 4.9  HOn3
38 934  OOn27 Ga 27 76.2 0.157 4.00 0.353 0.367 8.97 9.32 -0.4  Nstd
38 935  OO-9 Gauge 27 76.2 0.157 4.00 0.353 0.367 8.97 9.32 -0.4  Nstd
38 936  OOe Gauge 27 76.2 0.157 4.00 0.353 0.367 8.97 9.32 -0.4  Nstd
38 937  9 mm Gauge 27 76.2 0.157 4.00 0.353 0.367 8.97 9.32 -0.4  Nstd
38 938  N Gauge 27 76.2 0.157 4.00 0.353 0.367 8.97 9.32 -0.4  Nstd
38 939  OOn2 Gauge 24 76.2 0.157 4.00 0.315   8.00   0.0  Kstd
   
"Double-Oh" started out quite confused because of the variations in track    
gauge and incompatibilities between toy train suppliers. Hi-Rail standards use    
the same dimensions, but have larger flanges. Such equipment will not run on    
"normal" OO Gauge track.  The use of HO gauge track in Britain allowed the use    
of easily obtained drive mechanisms to fit the smaller British prototype    
without making the engine too wide. The error in track gauge was less    
objectionable than the wide locomotive.    
     
Military models are available in 1:72 and 1:76 scales.    
   
Crain's Scale / Gauge Encyclopedia
39 Scale Name:  EM Scale        
  Scale Ratio:  1:80    
  Alternate Names:  HOj Scale   Eee-Em Note scale variants    
       EM = Eighteen Millimeter (track gauge)  
     Represented    Scale       Model Track Gauge Error  Track
  Ser #     Gauge  Inches Ratio   In/ft  mm/ft       Inches           mm %  Used
  Correct Gauge:      
39 940  4ft 8.5in 56.5 80 0.150 3.81 0.706   17.94   0.0  
39 941  Meter 39.4 80 0.150 3.81 0.493   12.51   0.0  
39 942  3 Foot 36 80 0.150 3.81 0.450   11.43   0.0  
39 943  2.5 Foot 30 80 0.150 3.81 0.375   9.53   0.0  
39 944  2 Foot 24 80 0.150 3.81 0.300   7.62   0.0  
39 945  15 Inch 15 80 0.150 3.81 0.188   4.76   0.0  
  Commonly Used Gauges    
39 946  EM Gauge 56.5 80 0.150 3.81 0.717   18.21   1.5  EMstd
39 947  Bing OO/HO 42 80 0.150 3.81 0.625   15.88   19.0  
39 948  EMn42 Ga 42 80 0.150 3.81 0.649 0.672 16.48 17.07 23.6  HOstd
39 949  HO Gauge 42 80 0.150 3.81 0.649 0.672 16.48 17.07 23.6  HOstd
39 950  21/32" Gauge 42 80 0.150 3.81 0.656   16.67   25.0  HOstd
39 951  EMn42 Ga 42 80 0.150 3.81 0.512   13.00   -2.5  
39 952  HOj Gauge 42 80 0.150 3.81 0.512   13.00   -2.5  
   
39 953  EM Gauge 56.5 72 0.167 4.23 0.717   18.21   -8.6  EMstd
   
Other scale ratios have been published for EM Scale, including 1:76 (OO Scale  
using EM Gauge). The use, in Japan, of HO gauge track with 1:80 scale has been  
mentioned for representing their 42 inch gauge trains. Some train sets were produced
in Britain at 1:82 scale to run on ewither OO or HO scale model railways.
   
Crain's Scale / Gauge Encyclopedia
40 Scale Name:  HO Scale        
  Scale Ratio:  1:87.1 Half size of British 0 Scale (7mm = 1 foot)
  Alternate Names:  3.5 mm = 1 foot "Aitch-Oh" not "Ho"        
     Represented    Scale       Model Track Gauge Error  Track
  Ser #     Gauge  Inches Ratio   In/ft  mm/ft       Inches           mm %  Used
  Correct Gauge:      
40 954  5ft 3 in 63 87.1 0.138 3.50 0.723   18.37   0.0  
40 955  4ft 8.5in 56.5 87.1 0.138 3.50 0.649   16.48   0.0  
40 956  3.5 Foot 42 87.1 0.138 3.50 0.482   12.25   0.0  
40 957  Meter 39.4 87.1 0.138 3.50 0.452   11.49   0.0  
40 958  3 Foot 36 87.1 0.138 3.50 0.413   10.50   0.0  
40 959  2.5 Foot 30 87.1 0.138 3.50 0.344   8.75   0.0  
40 960  2 Foot 24 87.1 0.138 3.50 0.276   7.00   0.0  
40 961  15 Inch 15 87.1 0.138 3.50 0.172   4.37   0.0  
  Commonly Used Gauges    
40 962  HOb5.5 66 87.1 0.138 3.50 0.741   18.82   -2.2  P4std
40 963  HObf5.25 63 87.1 0.138 3.50 0.741   18.82   2.4  P4std
40 964  P87bf5.25 63 87.1 0.138 3.50 0.739   18.77   2.2  P4std
40 965  EM Gauge 63 87.1 0.138 3.50 0.717   18.21   -0.9  EMstd
40 966  S4 Gauge 63 87.1 0.138 3.50 0.741   18.82   2.4  P4std
40 967  P4 Gauge 63 87.1 0.138 3.50 0.741   18.82   2.4  P4std
40 968  HO Hi-Rail 56.5 87.1 0.138 3.50 0.650 0.669 16.51 16.99 0.2  Marklin HO
40 969  HO Gauge 56.5 87.1 0.138 3.50 0.649 0.672 16.48 17.07 0.0  HOstd
40 970  HO Fine Ga 56.5 87.1 0.138 3.50 0.649 0.665 16.48 16.89 0.0  HOstd
40 971  P:87 Gauge 56.5 87.1 0.138 3.50 0.649 0.665 16.48 16.89 0.0  HOstd
40 972  Proto 87 Gauge 56.5 87.1 0.138 3.50 0.649 0.665 16.48 16.89 0.0  HOstd
40 973  87 / 16.5 Ga 56.5 87.1 0.138 3.50 0.649 0.665 16.48 16.89 0.0  HOstd
40 974  16.5 mm Ga 56.5 87.1 0.138 3.50 0.649 0.665 16.48 16.89 0.0  HOstd
40 975  21/32" Gauge 56.5 87.1 0.138 3.50 0.656   16.67   1.2  HOstd
40 976  HOE Gauge 56.5 87.1 0.138 3.50 0.625   15.88 0.00 -3.7  
40 977  Bing OO/HO 56.5 87.1 0.138 3.50 0.625   15.88 0.00 -3.7  
40 978  TTn Gauge 42 87.1 0.138 3.50 0.471 0.483 11.96 12.27 -2.3  TTstd
40 979  TT Gauge 42 87.1 0.138 3.50 0.471 0.483 11.96 12.27 -2.3  TTstd
40 980  HOn3.5 Ga 42 87.1 0.138 3.50 0.471 0.483 11.96 12.27 -2.3  TTstd
40 981  HOn42 Ga 42 87.1 0.138 3.50 0.471 0.483 11.96 12.27 -2.3  TTstd
40 982  HOm Gauge 39.4 87.1 0.138 3.50 0.471 0.483 11.96 12.27 4.1  TTstd
40 983  TT Gauge 39.4 87.1 0.138 3.50 0.471 0.483 11.96 12.27 4.1  TTstd
40 984  87 / 12 Ga 39.4 87.1 0.138 3.50 0.471 0.483 11.96 12.27 4.1  TTstd
40 985  HOn3 Gauge 36 87.1 0.138 3.50 0.413 0.429 10.49 10.90 -0.1  HOn3
40 986  87 / 10.5 Ga 36 87.1 0.138 3.50 0.413 0.429 10.49 10.90 -0.1  HOn3
40 987  HOm900 Ga 35.5 87.1 0.138 3.50 0.413 0.429 10.49 10.90 1.3  HOn3
40 988  TTn Gauge 36 87.1 0.138 3.50 0.471 0.483 11.96 12.27 14.0  TTstd
40 989  HOm800 Ga 31.5 87.1 0.138 3.50 0.353 0.367 8.97 9.32 -2.4  Nstd
40 990  HOn30 Ga 30 87.1 0.138 3.50 0.353 0.367 8.97 9.32 2.5  Nstd
40 991  87 / 9 Ga 30 87.1 0.138 3.50 0.353 0.367 8.97 9.32 2.5  Nstd
40 992  HO-9 Gauge 30 87.1 0.138 3.50 0.353 0.367 8.97 9.32 2.5  Nstd
40 993  HOn9 Gauge 30 87.1 0.138 3.50 0.353 0.367 8.97 9.32 2.5  Nstd
40 994  9 mm Gauge 30 87.1 0.138 3.50 0.353 0.367 8.97 9.32 2.5  Nstd
40 995  N Gauge 30 87.1 0.138 3.50 0.353 0.367 8.97 9.32 2.5  Nstd
40 996  HOn2.5 Ga 30 87.1 0.138 3.50 0.353 0.367 8.97 9.32 2.5  Nstd
40 997  HOm750 Ga 29.5 87.1 0.138 3.50 0.353 0.367 8.97 9.32 4.2  Nstd
40 998  HOm75 Ga 29.5 87.1 0.138 3.50 0.353 0.367 8.97 9.32 4.2  Nstd
40 999  HOe Gauge 29.5 87.1 0.138 3.50 0.353 0.367 8.97 9.32 4.2  Nstd
40 1000  87 / 9 Ga 29.5 87.1 0.138 3.50 0.353 0.367 8.97 9.32 4.2  Nstd
40 1001  HO-9 Gauge 29.5 87.1 0.138 3.50 0.353 0.367 8.97 9.32 4.2  Nstd
40 1002  HOn9 Gauge 29.5 87.1 0.138 3.50 0.353 0.367 8.97 9.32 4.2  Nstd
40 1003  9 mm Gauge 29.5 87.1 0.138 3.50 0.353 0.367 8.97 9.32 4.2  Nstd
40 1004  N Gauge 29.5 87.1 0.138 3.50 0.353 0.367 8.97 9.32 4.2  Nstd
40 1005  HOn2 Gauge 24 87.1 0.138 3.50 0.276 0.290 7.01 7.37 0.2  HOn2
40 1006  N Gauge 24 87.1 0.138 3.50 0.353 0.367 8.97 9.32 28.1  Nstd
40 1007  HOm600 23.6 87.1 0.138 3.50 0.276 0.290 7.01 7.37 1.9  HOn2
40 1008  HOz Gauge 23.6 87.1 0.138 3.50 0.257 0.270 6.53 6.86 -5.1  Zstd
40 1009  HOi Gauge 23.6 87.1 0.138 3.50 0.257 0.270 6.53 6.86 -5.1  Zstd
40 1009a  HOf Gauge 23.6 87.1 0.138 3.50 0.257 0.270 6.53 6.86 -5.1  Zstd
40 1010  Z Gauge 23.6 87.1 0.138 3.50 0.257 0.270 6.53 6.86 -5.1  Zstd
40 1011  HOn15 Gauge 15 87.1 0.138 3.50 0.157   3.99 0.00 -8.8  Zstd
       
The name, HO Scale means half of (British) O Scale, 7 mm = 1 foot, but the  
British never pursued HO like modelers in the USA. More than 50 percent of  
all modelers in USA use this scale. What else needs to be said! Early HO  
models were built to various scales (1:72, 1:76, 1:82, 1:90) - some modern  
models are still not too close to the correct scale of 1:87, others are  
exceptionally well detailed and very precise scale models. It usually depends on  
price. I have seen a reference to HOf gauge but don/t know any more.
   
Crain's Scale / Gauge Encyclopedia
41 Scale Name:  OOE Scale        
  Scale Ratio:  1:91.4    
  Alternate Names:  1 cm = 3 feet ("Oh-Oh-Eee")  1.1 mm = 1 meter  
     Represented    Scale       Model Track Gauge Error  Track
  Ser #    Gauge  Inches Ratio   In/ft  mm/ft       Inches           mm %  Used
  Correct Gauge:      
41 1012  4ft 8.5in 56.5 91.4 0.131 3.33 0.618   15.70   0.0  
41 1013  3.5 Foot 42 91.4 0.131 3.33 0.460   11.67   0.0  
41 1014  Meter 39.4 91.4 0.131 3.33 0.431   10.95   0.0  
41 1015  3 Foot 36 91.4 0.131 3.33 0.394   10.00   0.0  
41 1016  2.5 Foot 30 91.4 0.131 3.33 0.328   8.34   0.0  
41 1017  2 Foot 24 91.4 0.131 3.33 0.263   6.67   0.0